A rate-adaptive MAC protocol for multi-Hop wireless networks
Proceedings of the 7th annual international conference on Mobile computing and networking
Opportunistic media access for multirate ad hoc networks
Proceedings of the 8th annual international conference on Mobile computing and networking
802.11 Wireless Networks: The Definitive Guide
802.11 Wireless Networks: The Definitive Guide
Performance Enhancement of Multirate IEEE 802.11 WLANs with Geographically Scattered Stations
IEEE Transactions on Mobile Computing
Improving Quality of Service and Assuring Fairness in WLAN Access Networks
IEEE Transactions on Mobile Computing
Airtime Fairness for IEEE 802.11 Multirate Networks
IEEE Transactions on Mobile Computing
Performance Enhancement of IEEE 802.11b WLANs Using Cooperative MAC Protocol
ICCSA '09 Proceedings of the International Conference on Computational Science and Its Applications: Part II
Cooperative wireless communications: a cross-layer approach
IEEE Wireless Communications
Cooperative communication in wireless networks
IEEE Communications Magazine
Performance analysis of the IEEE 802.11 distributed coordination function
IEEE Journal on Selected Areas in Communications
CoopMAC: A Cooperative MAC for Wireless LANs
IEEE Journal on Selected Areas in Communications
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In IEEE 802.11, the rate of a station (STA) is dynamically determined by link adaptation. Low-rate STAs tend to hog more channel time than high-rate STAs due to fair characteristics of carrier sense multiple access/collision avoidance, leading to overall throughput degradation. It can be improved by limiting the transmission opportunities of low-rate STAs by backoff parameters. This, however, may cause unfair transmission opportunities to low-rate STAs. In an attempt to increase overall throughput by volunteer high-rate relay STAs while maintaining fairness, we propose a new cooperative medium access control (MAC) protocol, relay-volunteered multi-rate cooperative MAC (RM-CMAC) based on ready to send/clear to send in multi-rate IEEE 802.11. In the RM-CMAC protocol, we show that the effect of hogging channel time by low-rate STAs can be remedied by controlling the initial backoff window size of low-rate STAs and the reduced transmission opportunity of low-rate STAs can be compensated by the help of volunteer high-rate relay STAs. We analyze the performance of RM-CMAC, i.e., throughput and MAC delay, by a multi-rate embedded Markov chain model. We demonstrate that our analysis is accurate and the RM-CMAC protocol enhances the network throughput and MAC delay while maintaining the fairness of low-rate STAs.